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20121222
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the way scientists test new medicines all at the same time. health and science reporter carolyn johnson explains. >> the doctor believes she's zebra fish to light the way to major drug discoveries. >> the big breakthrough was to use the firefly protein which gives a strong light signal. >> he and his colleagues are part of an international team that's using the zebra fish to screen potential treatments for conditions ranging from obesity to diabetes. they have attached a genetic light switch to a pathway associated the production of glucose or blood sugar. >> meaning when the fish produce glucose in the liver, the light shines up. >>> the result is a fish that can be used as a living, swimming litmus test. the green flow seen in this video is not only visible to researchers, it's also measurable. a brighter lights indicates a higher level of glucose, used as a barometer in research. as one study they zeroed in a potential obesity drug after screening nearly 2500 candidates using the genetically modified fish. >> we put three fish in and add the drug compounds like one per well so we can
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